Helmet assembly



FIG. 1 is a perspective view of a helmet assembly;

FIG. 2 is a right side view of the helmet assembly;

FIG. 3 is a left side view of the helmet assembly;

FIG. 4 is a rear view of the helmet assembly;

FIG. 5 is a front view of the helmet assembly;

FIG. 6 is a top view of the helmet assembly; and,

FIG. 7 is a bottom view of the helmet assembly. 

We claim the ornamental design for a helmet assembly, as shown and described. 